ABB PSTX30 Installation And Commissioning Manual page 112

7.18 Special feature
This chapter describes features that are available to
all users, but beyond the normal range of use for the
softstarter.
The features are:
• Line contactor close time
• TOR relay delay time
• Start without start command
• Step down level
• System mode
• Limp mode
• Motor connection
7.18.3 Line contactor close time
This feature allow time for the line contactor to close
before the softstarter assumes that it has correct three
phase supply.
This is useful to avoid timing problems that can lead to
unnecessary trips on for example Phase loss protection.
Line contactor close time is configured with the
7
following parameters:
Parameter
28.02 Line contactor close time
7.18.4 TOR relay delay time
TBD
TOR relay delay time is configured with the following
parameters:
Parameter
28.03 TOR relay delay time
7.18.5 Limp mode
This feature allow the PSTX to operate with only two
controlled phases in case of short circuit of one set of
thyristors. A warning will be activated (if the short circuit
warning is enabled) and the thyristors should be replaced
as soon as conveniently possible.
Limp mode is configured with the following
parameters:
Parameter
28.41 Limp mode
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Description
Allow time for line contactor to close. Sets
the time between start signal and beginning
of diagnostic measurements.
Description
Set the delay time from Top Of Ramp until
the Top Of Ramp relay is activated
Description
If this parameter is enabled and
if a thyristor is shorted, there will
be an automatic transition to
limp mode.
Setting range Default value
0 ... 65535 ms 245 ms
Setting range Default value
0.0 ... 300.0 s 0.0 s
Setting range Default value
Off, On Off